I'll echo Sister Sandy
Your duties will depend on your officer's. I don't know about other orgs but AGD has several teams which can be 3-4 officers, including the EC officer.
Finance is definitely time-dependant!!
My chapter prefers to have advisors who have been out of school 3 years. It can be less depending on the urgency and whether the advisor attended school there.
It depends on what the overall advisors v officers/members relationships are. Some collegiates don't like "outsiders" while other say "come on!!!"
Don't forget to consider how demanding your own course work will be....and your "private" life, lol.
Maybe you could offer to help out an official advisor to see how things work ot.
It's a very good way to feel old and young at the same time!!